live and listen topresidentobamaaddressthe nation. >> we do have new numbers on wounded. over 100,000. >> white house official, "any event with multiple explosive devide v device as this appears to be a clearly an act after terror." >> the most common injuries are bone and tissue injuries. >> they really don't have a direction one way or another as to who did this. >> we're watching this city bring its assets together. >> it is tuesday, april 16th. >> obviously the city is still in a state of shock. >> everyone wants to make implicati implications. we don't though. the white house doesn't know. >> in terms of suspects, right now there is no one in custody. >> heavy security today not only in boston. >> the president saying today this is being investigated as an act of terror. >> explosive devices containing ball bearings. >> they are crudely made. they appear to have been assembled inside a pressure cooker. >> we're just emerging now from the first 24 hours following that deadly bombing in the boston marathon. authorities are still on the scene there. take a look. they continue th